Can anyone provide more information on switch or point me to where I can find more about it? The only I've been able to find on the wiki is: http://www.voip-info.org/tiki-index.php?page=Asterisk+-+dual+servers and towards the bottom of (section Forwarding to another Asterisk): http://www.voip-info.org/wiki-Asterisk+config+extensions.conf Some of the questions I have are: 1) If I have an asterisk machine being used only as a VoIP gateway to the PSTN, and I have multiple asterisk machines behind it waiting to make or receive calls through/from the gateway, can I have multiple switch statements in the same context, so that if the gateway tries to contact asterisk machine 1 and it's not available, try the next one and so on? 2) How to configure the other asterisk machines to use the VoIP gateway for all outbound calls? I read somewhere that you cannot have circular references using switch, but I'm not sure if it refers to what I'd like to do 3) Assuming the VoIP gateway cannot contact any of the other asterisk machines, can the voip gateway put calls on hold and continue trying and only disconnect or play busy tone after some pre-defined period of time? Thanks, Daniel